Module: Prawn::Graphics::BlendMode
- Included in:
- Prawn::Graphics
- Defined in:
- lib/prawn/graphics/blend_mode.rb
Overview
The Prawn::BlendMode module is used to change the way two layers are blended together.
Passing an array of blend modes is allowed. PDF viewers should blend layers based on the first recognized blend mode.
Valid blend modes in v1.4 of the PDF spec include :Normal, :Multiply, :Screen, :Overlay, :Darken, :Lighten, :ColorDodge, :ColorBurn, :HardLight, :SoftLight, :Difference, :Exclusion, :Hue, :Saturation, :Color, and :Luminosity.
Example:
pdf.fill_color('0000ff')
pdf.fill_rectangle([x, y+25], 50, 50)
pdf.blend_mode(:Multiply) do
pdf.fill_color('ff0000')
pdf.fill_circle([x, y], 25)
end
Stable API collapse
Instance Method Details
#blend_mode(blend_mode = :Normal) ⇒ Object
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# File 'lib/prawn/graphics/blend_mode.rb', line 32 def blend_mode(blend_mode = :Normal) renderer.min_version(1.4) save_graphics_state if block_given? renderer.add_content "/#{blend_mode_dictionary_name(blend_mode)} gs" if block_given? yield restore_graphics_state end end |